Vending machine control circuit

ABSTRACT

A vending machine control circuit is provided in which a plurality of magnetically latched selector relays selectively enable the dispensing of various ingredients. These selector relays are all controlled by a single magnetically latched vending relay which provides an enabling interconnection between vending cycle sequencing switches and a given one of the selectors relays when the latter is selectively actuated for the purpose of dispensing a selected ingredient from the vending machine. Manual switches are provided to disable, selectively, one or more of the vending machine functions to provide for testing and cleaning of the vending machine and its components. There is also provided a means for actuating the selector relays which precludes more than one of these being actuated throughout any one vending cycle. False vending is precluded by the magnetic latching and the circuit interconnections of the relays and the sequencing switches.

United States Patent [191 Lamb ['11] 3,802,542 [451 Apr. 9, 1974 1VENDING MACHINE CONTROL CIRCUIT [75] Inventor: William B. Lamb,Petersburg, Ind.

[73] Assignee: AMF Incorporated, White Plains,

[22] .Filed: Mar. 6, 1972 [21] Appl. No.: 232,112

[52 us. CL; 194/13, 222/76 Primary Examiner--Stanley H. TollbergAssistant Examiner-Thomas E. Kocovsky Attorney, Agent, brFirm-George WPrice; John H. Gallagher l 57 ABSTRACT A vending machine control circuitis provided in which a plurality of magnetically latched selector relaysselectively enable the dispensing of various ingredients. These selectorrelays are all controlled by a single magnetically latched vending'relaywhich provides an enabling interconnection between vending cyclesequencing switches and a given one of the selectors relays when thelatter is selectively actuated for the purpose of dispensing a selectedingredient from the vending machine. Manual switches are provided todisable, selectively, one or more of the vending machine functions toprovide for testing and cleaning of the vending machine and itscomponents. There is also provided a means for actuating the selectorrelays which precludes more than one of these being actuated throughoutany one vending cycle. False vending is precluded by the magneticlatching and the circuit interconnections of the relays and thesequencing switches.

12 Claims, 1 Drawing Figure VENDING MACHINE CONTROL CIRCUIT Thisinvention relates to vending machine control circuits and moreparticularly to a vending machine circuit utilizing a plurality ofmagnetically latched relays to control the selected dispensing of vendeditems from a vending machine.

. It is an object of the present invention to provide a new and novelvending machine control circuit.

It is another object of the present invention to provide a new and novelvending machine control circuit utilizing magnetically latched relays inwhich the number of relays is held to an optimal minimum.

Another object of the present invention is to provide a new and novelvending machine control circuit in which false vending caused by personsstriking the vending machine or momentary power failure or line voltagedips will be obviated.

Still another object of the present invention is to provide a new andnovel vending machine control circuit utilizing a plurality of relayswherein only one operating diode is needed for all of the ingredientselecting relays in the circuit and only a single reset diode is neededfor the plurality of relays.

Yet another object of the present invention is to pro- .vide a newand'novel vending machine control circuit wherein a plurality of relaysare utilized as the control means thereof and wherein the circuit is soconstructed as to provide for adding'on additional relays to enhance theingredient selecting capability of the circuit with regard to vending anadditional plurality of articles from a machine.

The foregoing and other objects and advantages of the invention willappear more fully hereinafter from a consideration of the detaileddescription which follows, taken together with the accompanying drawingwherein a single embodiment of the invention is illustrated by way ofexample. It is to be expressly understood, however, that the drawing isfor illustration purposes only and is not to be construed as definingthe limits of the invention. 1

The drawing comprises a schematicdiagram of the vending machine controlcircuit of the present invention.

Basically, the invention comprises a plurality of relays known asselector relays which are controlled by push button switches toindividually control, subject to the overriding control of the mastervending relay, the dispensing of variousingredients from a vendingmachine.

The relays control motors and solenoid valves or the like which are thecontrol means by which any given selected ingredientin the machine isdispensed. All of the relays involved are of the magnetically latch typesuch that line voltage circuits, temporary or momentary power failures,and striking of the machine by customers or vandals in an attempt tocause false vending over and above the control superimposed by themaster or vending relay, are precluded. Provision is also made fortesting the circuitwithout running through an actual vending cycle orwithout placing a coin in the coin receiving mechanism of the vendingmachine.

In the preferred embodiment to be described herein, the vending machinerelates to the dispensing of various ingredients such as colas, coffee,hot chocolate, and the like.

As an example of the latching relays utilized in the present invention,reference is made to US. Pat. Nos. 3,470,510 and 3,599,133 to Richert,granted Sept.- 30, 1969 and Aug. 10, 1971, respectively. Solenoidvalves, blender motors, ingredients dispensing motors, and in.- gredientwhipping motors, together with such things-as coin mechanisms and thelike are all disclosed in the prior art and accordingly, will not bespecifically described in detail in connection with the control circuitof the present invention. 1

' Referring in detail to the drawing, the vending machine controlcircuit 10 of the present invention is shown as including a coinmechanism 12 having terminals A through l-l thereon, the terminal I-lcomprising a ground or common connection. The control circuit 10 also isprovided with a grounded alternating current (A.C.) source 14 which is'schematically shown. The output of the A.C. source 14 is taken through afuse or circuit breaker 16. I

The main power terminal 18 is connected through a machine safety switchS1 of the single-pole-doublethrow type with-normally open and normallyclosed contacts, by the normally closed contact and a lead 20 to thenormally closed contact 52B of a vending cup reservoir switch S2 whichalso is of the single-poledouble-throw'type and also with normallyclosed and normally open contacts 52B and 82C, respectively. The switchactuating arm 82A of the vending cup sensing switch S2 is also connectedby a line 22 back to the terminal G of the coin mechanism 12.

The main power terminal 18 also is connected through one side of a waterbath fill and agitator motor control switch S3 which is of thedouble-pol e-doublethrow type shown in its normally closed contactposition. In the position shown, the switch S3 has a first common ormovable contact S3A connected to.a normally closed contact S2Al which inturn is connected through the agitator motor AM to a common ground lead24. A second common or'movable contact 838 of the switch S3 is connectedto a second normally closed contact S3B1, which in turn is connectedthrough a water bath fill control solenoid WBS to the common ground lead24. The second normally closed contact S3B1 serves as the normally opencontact for the first common contact 53A. An additional contact S3C isprovided as the normally open neutral contact for the second commoncontact $38.

A plurality of cam actuated vending cycle control switches are shown atthe right hand side of the drawing as follows:

An ingredient motor control switch S4 is provided with a common ormovable contact S4A, normally closed neutral contact 84B and a normallyopen contact S4C.

A water solenoid and whipper motor control switch S5 has a common ormovable contact SSA, as normally closed contact 85B and a normallyfopenneutral A select relay reset switch S8 is provided with a commonactuating contact SSA, a normally closed neutral contact 88B and anormally open contact S8C.

A manual ingredient and test switch S9 and a water and water flushswitch S are also provided in the circuit but do not form a part of thecam operated cycling bank of switches S4 through S8.

The manual ingredient and test switch S9 is of adouble-pole-double-throw configuration having a first common contact'S9A engaging a normally closed contact S9A1 and having a normally openneutral contact S9A2, while the other side of the switch S9 includes asecond common contact S9B in engagement with a normally closed contactS9B1 and having a normally open contact S9B2.

The water and water flush switch S10 is of a triple- I pole-double-throwconfiguration having a first common contact SlOA cooperating with afirst normally closed contact S10Al and a first normally open contactS10A2; a second common contact S10B cooperating with a second normallyclosed contact S10B1 and a second normally open contact 51032; and athird common contact S10C cooperating with a third normally closedcontact S10C1 and a third normally open contact S10C2.

In normal use the switches S9 and S10 maintain power connections fromthe bank of cam operating switches S4 through S8 with the coin mechanism12. During test operations, throwing of the switches S9 and S10 to theirnormally closed positions permit testing of the circuitry 10 withoutcausing a dispensing of ingredients from the vending machine with whichit is associated as will hereafter be more fully described.

The second common contact S10B of the switch S10 is connected directlyto the terminal G of the coin mechanism 12 while its associated normallyclosed contact S10B1 is connected by a line 26 to the common contact,SSA and 86A of the water solenoid and whipper motor switch S5 and thewater solenoid blender motor switch S6, respectively.

Further, the lead 22 from the cup sensing switch S2, which is connectedto the terminal G of the coin mechanism 12, also extends to the commoncontacts 87A and 88A respectively of the motor lock switch S7 and theselect relay reset switch S8. The ingredient motor control switch S4 hasits common contact S4A connected by a line 29 directly to the secondnormally closed contact S9B1 of the switch S9 and thence through thecommon contact S9B thereof and a line 31 to the line 22 which has beenpreviously described as directly connected to the terminal G of the coinmechanism 12.

A plurality of ingredient selection relays, four in number in thepreferred embodiment shown and described herein, are shown as includingfirst, second, third and fourth vending relays R1, R2, R3 and R4,respectively. A main vending control relay R5 is also provided. All ofthese relays, as hereinbefore generally described, are of the magneticlatch type and in a preferred configuration are similar to those relaysshown in the above-designated Richert Patents.

The selection or vending relays R1, R2, R3 and R4 include first, secondand third control contact pairs RlA, RIB and RlC; R2A, R2B and'R2C; R3A,R38 and R3C; and R4A, R43 and R4C, respectively. The main vending relayR5 includes first and second control contact pairs RSA and RSB.

Theselector relays R1 through R4 are actuated by conventional selectorpush button switches Pl through P4, respectively, which are normallylocated on the face of a vending machine for the purpose of customerselection of the ingredients to be dispensed. The push button selectorswitches P1 through P4 include respective normally closed contacts PIA,P2A, P3A and P4A and respective normally open contacts P18, P28, P38 andP4B. The common or movable contacts of each of the push button switchesbears the same designating number as that for the push button switchitself and actuation of any one of the said push button switches Plthrough P4 causes a single-pole-double-throw actuation from the normallyclosed position thereof to close the normally open position thereof.

The said normally open contacts PlB through P4B are also connecteddirectly through one side of the relay coils for the selector relays R1through R4, respectively; the other side of the coils of the selectorrelays being connected to a common ground terminal lead 30.

The coils of relays R1 to R4 are respectively connected through relayprotective or damping resistors RlR, R2R, R3R and R4R to a commonconnection with the anode of a first diode D1 having its cathodeconnected through the line 28 to the normally open contact 88C of theswitch S8 which is the reset switch for the selecting relays R1 throughR4.

One side of the actuating coil for the vending control relay R5 isconnected through the cathode to anode path of a control or reset diodeD2 and associated damping resistance RSR to a common lead 32 with thenormally open contact of each of the first control contact pairs RlAthrough R4A of the selector relays R1 through R4. The common lead 32 forthis connection is further connected to the normally open contact 87C ofthe operated control switch S7 and thence directly to the normallyclosedcontact S10A1 of the switch S10 through the common contact SlOA tothe movable contact 8382 of the control switch S3 and through thenormally closed contact SCBl thereof and the water bath solenoid WBS tocommon ground connection 24.

The common lead 32 also has a connection to one side of a cam motor CMthe latter having its other side connected to ground. The cam motor CMcontrols the sequence of actuation of the cam operated control switchesS4 through S8. Further, a vending turret index control switch S11, whichis provided to control the actuating of a vending turret of conventionaldesign, has a normally open contact SllC connected to one side of anindex motor IM which in turn has its other side connected to ground. Thevending switch S11 further includes a common or movable contact S1 1Adirectly connected to the common lead 32 to a normally closed neutralcontact SIlB. As previously described, one side of the actuating coilfor the vending control relay R5 is connected to the cathode of thediode D2 while the other side of the actuating coil for the vendingrelay R5 is connected to the common ground lead 30. The cathode of thesecond diode D2 is connected to the anode of a third diode D3 which inturn'has its cathode connected directly to the terminal E on the coinmechanism 12 by a lead 34. The lead 34 also extends to the secondnormally open contact 8982 in the control switch S9, the latter beingdesignated as a manual ingredient and test switch. Accordingly, the saidsecond normally contact S9B2 of the switch S9 is directly c'on- I nectedto the terminal E of the coin mechanism 12.

The movable contacts in each of the first control contact pairs RlAthrough R4A of the selector relays R1 through R4, respectively, areconnected through a common lead 36 to the normally open contact of thefirst control contact pair RSA of the vending control relay R5. In eachinstance, the normally closed contact of the first control contact pairRlA through RSA for the vending control relay and the selector relays isa neutral contact. In turn, the common lead 36 comprises a directconnection to the terminal A of the coin mechanism 12. The normallyclosed contacts of the second control contact pair RIB through R4B ofthe selector relays R1 through R4 are connected through a common lead 38directly to the second normally open contact SB2 in the control switchS10.

The common or movable contact in the first contact control pair RSA ofthe vending relay R5 is connected to the anode of a fourth diode D4which has its cathode connected by a common lead 40 to the movablecontact of the first push. button switch P1 and thence through a seriesconnection of the normally closed contacts of all of the said pushbutton switches, namely, contacts PIA, P2, P2A, P3, P3A, P4 and P4Awhich is the neutral contact for the fourth push button switch P4.

The normally open contacts-in the second control contact pairs RIB, R2B,R3B and R4B are all connected by a common lead 42 to the normally closedcontact SSB of the water solenoid and whipper motor control switch S5which is in the bank of cam operated switches. The common or movablecontacts for each of the second control contact pairs RIB through R4Bare respectively connected to common junctions J1, J2, J3 and J4, thesaid junctions being respectively connected to one side of a parallelconnected water solenoid and whipper motor pairs WSl-Ml, WS2-M2, WS3-M3,

.WS4-M4, respectively, each of these parallel connected solenoid andmotor pairs having the other side thereof connected directly to thecommon ground lead 24. 1

In the third control contact pairs RIC through R4C of the selectorrelays R1 through R4, the normally closed contacts thereof are allneutral contacts while the common actuating contacts thereof are allconnected through a common lead 44 to the normally open contact 84C ofthe ingredient control cam operated switch S4. In these thirdcontact'pairs, the normally open contacts are connected to the one sideof respectively associated ingredient dispensing motors MIA, M2A, M3Aand M4A, with the opposite side of the motors being connected directlyto the common ground lead 24. To complete the connection of all thewater solenoids and dispensing motor combinations, an additional watersolenoid WSS and blender motor M5 are co nnected in a parallelarrangement having one side thereof connected to the common groundterminal 24 and having the other side thereof connected through a commonlead 46 to the second normally open contact S10A2 in the control switchS10, and then directly to a normally open contact 86C in the watersolenoid and I blender motor control switch S6 in the bank of cam opopencontact thereof is a neutral contact while the common or movable contactthereof is connected directly with the normally closed contact 873 inthe cam operated motor lock switch S7, which through the circuitpreviously described via the line 22 in the normally closed condition ofthe switch S7, connects the common contact of the second contact pairRSB directly to the terminal G of the coin mechanism 12. The normallyclosed contact of the second control contact pair RSB is directlyconnected with the common contact SlOC of the control switch S10 via alead 48, which by way of the normally closed contact S10C1 is, in turn,directly connected to the normally closed contact S9Al of theswitch S9through its common contact S9A. A

lead 50, connected to contact S9A, directly connects the normally closedcontact of the second control contact pair RSB with the terminal D ofthe coin mechanism 12 in the quiescent state of the circuit 10.

In the operation of the circuit 10 of the present invention, assumingthat the initial state of the circuit is as shown in the drawing, theoperation is as follows:

The proper amount of money is inserted'in the coin mechanism 12 togenerate an alternating current pulse at the terminal E of the coinmechanism 12. This pulse causes thevend relay R5 to be energized throughthe lead 34 and third diode D3, whereby the relay R5 will pull in andmagnetically latch, changing the state of the first and-second controlcontact pairs RSA and R58, respectively.

After the vend relay R5 has been operated to a latch position, power isapplied to the push button selection switches Pl through P4 through thefirst control contacts RSA of the said vend relay R5 from the powerterminal A of the coin mechanism 12. Also, power has now been removedfrom the terminal D of the coin mechanism 12 due to the switching actionof the vending relay R5, making it inoperative, by the second controlcontacts RSB of the vending relay R5.

When a push button selection switch Plthrough P4 is operated, power isapplied through the relayv coil of the respectively associated selectingrelays R1 through R4 allowing it to pull in and magnetically latch. Theseries connection of the push button switches Pl through P4 allows onlyoneof the'select relays R1 through R4 to to operate, i.e., the first oneactuated. After one of the select 're'lays- R1 through R4 has beenoperated, power is applied to the vend relay reset circuit from terminalA of coin mechanism 12, through line 36, through the control contactsRlA through R4A, through'line 32,'resistor RSR, diodode D2, and throughrelay R5 to ground line 30. This causes the vend relay to release,opening the push button circuit via the line 40 and thereby preventing asecond selection from actuating another of 'the select relays R1 throughR4. Power is also applied to the cam motor CM through the appropriatefirst control contact pair RlA through R4A of the operated one of theselect relays R1 through R4 from the terminal A of the coin mechanism12. The motor lock switch S7 transfers immediately, under actuation bythe cam motor CM, after the cam motor CM is energized, thereby keepingpower off the coin mechanism terminal D. This keeps the coin mechanism12 from accepting any more coins during a vend cycle. Power is appliedto the cam motor CM through the motor lock switch S7 after it has beentransferred under the influence of the cam motor and through theappropriate first control contact pair RlA through R4A of therespectively actuated selecting relay R1 through R4.

' After one of the select relays R1 through R4 has been energized, itsthird control contacts pair (RIC through R4C) provide a path from therespective one of the ingre'dient motors MlA through M4A to theingredient motor switch S4, the latter being under ultimate control inthe vending cycle of the cam motor CM. Furthermore, the appropriatesecond control contact pair RIB through R4B of the controlled relays R1through R4 provides a path from the respective one of the whipper motorsM1 through M4 and the water solenoids WSl through WS4 to the whippermotor and water solenoid switch S5, the latter also being under thecontrol of the camming motors CM. The blender motor M5 and itsassociated water solenoid WSS are connected directly to the proper cammotor switch S6.

There is also a direct connection from the cam motor CM through thewater and water flush switch S to the main water solenoid WBS so thatany time power is applied to the cam motor CM, power is also applied tothe main water solenoid WBS, except during manual operation of the waterand water flush switch S10.

The cam motor switches S4 through S8, determine the sequence of eventsduring the vend cycle after the vend relay R5 has been energized via thecoin mechanism l2 and one of the select relays R1 through R4 has beenenergized via a push button select switch Pl through P4 respectively.

When the vend cycle is complete, the select relay reset switch S8 iscaused to transfer to its closed state by the camming motor CM therebyapplying power to all of the associated reset coils of the select,relays R1 through R4, causing the latch of these relays to reset to itsquiescent position. This removes a path of power to the cam motor CM bythe first control contacts pairs RlA through R4A of the select relays R1through R4. The select relay reset switch S8 then transfers back to itsinitial open position. To complete the vending cycle, the cam motor CMcontinues to run through the motor lock switch S7 until it transfersback to its initial open position under the influence of the cam motorCM. This removes power from the cam motor CM and reapplies power to theterminal D of the coin mechanism 12 to return the circuit 10 to itsquiescent state.

The'manual ingredient and test switch S9 may be used to by-pass the coinmechanism 12. When the switch S9 is operated, power is applied to thelatching coil of the vend relay R5 setting up the vending controlcircuit 10 for a normal vending cycle. The manual ingredient and testswitch S9 is a double-pole-doublethrow center-off switch. In thecenter-off position of the switch S9, ingredient motor power is removedso that a test cycle can be run without the ingredient motors MIAthrough M4A being operated and thereby precluding the dispensing ofingredients during this phase of testing the circuit.

The water and water flush switch S10 is a three-poledouble-throwcenter-off switch. When operated power is applied to all motors andsolenoids except the ingredient motors MIA through M4A. The purpose ofthis function is to flush the entire system with water for san itarypurposes. When the water and water flush switch S10 is in the center-offposition, all motors and solenoids are disabled except for theingredient motors MIA through M4A. Therefore, the ingredient output foreach selection, via each of the selecting relays R1 through R4 and theirassociated push button switches P1 through P4 may be tested by way ofthis function of the water and water flush switch S10.

The water bath fill and agitator motor switch S3 is adouble-pole-double-throw switch and may be used to energize the mainwater solenoid WBS without applying power to the water bath agitatormotor AM.

As can now be readily seen from the foregoing specification and drawing,this invention provides a new and novel magnetically latched relaycontrol vending machine circuit which is substantially preclusive offalse vending, is readily expandable to include additional selection andvending functions and which provides for a plurality of manual overrideand test functions using an optimally minimum number of electricalcomponents.

Although but a single embodiment of the invention has been illustratedand described in detail, it is to be expressly understood that theinvention is not limited thereto. Various changes may also be made inthe design and arrangement of the parts without departing from thespirit and scope of the invention as the same will now be understood bythose skilled in the art.

I claim:

1. A vending machine control circuit comprising:

coin mechanism means;

main vending relay means responsive to said coin mechanism means toenable said control circuit for a vending sequence;

selector relay means for selecting ingredients to be dispensed includingmanual selector means for each said selector relay means designating atleast one ingredient to be dispensed in a given vending sequence;

vending sequence switch means controlling the execution of a vendingsequence-in response to a concurrent change of state of said mainvending relay means and one of said selector relay means from aquiescent state to a vend state; a source of electric power; circuitmeans interconnecting said main vending relay means with said powersource through said coin mechanism means, and-said selector relays withsaid power source through said main vending relay means;

ingredient dispensing means interconnected with and enabled byrespective ones of said selector relay means for interconnection andactuation by said vending sequence switch means;

said manual selection means for said selector relay means comprisingcircuit means precluding concurrent actuation of more than one of saidselector relay means;

said main vending relay means and said selector relay means beingmagnetically latched in both said quiescent and vend states thereof topreclude false vending; and

means including circuit means associated with each of said selectorrelay means for latching said vending relay back to its quiescent stateupon the latching of a selector relay to its vend state,

the return of said vending relay to said quiescent state operating todisable said manual selector means for the selector relay means,

thereby prohibiting the premature initiation of a subsequent vendingsequence.

2. The invention defined in claim 1, wherein said vending sequenceswitch means includes a reset switch for said selector relay means; and

wherein said selector relay'means are interconnected through a commonreset circuit path with said reset switch means.

3. The invention defined in claim 2, wherein each of said selector relaymeans comprises an actuating coil and said common reset circuit pathcomprises a resistance in series with each said coil, connected througha common diode means to said reset switch means.

4.- The invention defined in claim 1, wherein said control circuitfurther includes manual switch means selectively disabling portions ofsaid vending sequence switch means, to modify said vending sequence fortesting said control circuit while precluding actuation of saidingredient dispensing means and selectively bypassing said coinmechanism to interconnect said main vending relay means directly withsaid power source.

5. The invention defined in claim 1, wherein said control circuitfurther includes means for flushing and cleaning an associated vendingmachine; and

control switch means selectively disabling said ingredient dispensingmeans while enabling an otherwise complete vending cycle and selectivelyenabling said ingredient dispensingmeans while precluding a completevending cycle, said selective disabling function effecting a flushingand cleaning cycle and said selective enabling function effecting a testcycle only of said ingredient dispensing means.

6. The invention defined in claim 1, wherein said control circuitfurther includes manual switch means selectively disabling portions ofsaid vending sequence switch means, to modify said vending sequence fortesting said control circuit while precluding actuation of saidingredient dispensing means and selectively bypassing said coinmechanism to interconnect said main vending relay means directly withsaid power source;

wherein said control circuit further includes means for flushing andcleaning an associated vending machine; and

control switch means selectively disabling said ingredient dispensingmeans while enabling an otherwise complete vending cycle and selectivelyenabling said ingredient dispensing means while-precluding a completevending cycle, said selective disabling function effecting a flushingand cleaning cycle and said selective enabling function effecting a testcycle only of said ingredient dispensing means.

7. The invention defined in claim 1, wherein said vending sequenceswitch means includes a reset switch for said selector relay means;

wherein said selector relay means are interconnected through a commonreset circuit path with said reset switch means;

wherein each of said selector relay means comprises an actuating coiland said common reset circuit path comprises a resistance in series witheach said coil, connected through a common diode means to said resetswitch means;

wherein said control circuit further includes manual switch meansselectively disabling portions of saidvending sequence switch means, tomodify said vending sequence for testing said control circuit whileprecluding actuation of said ingredient dispensing means and selectivelyby-passing said coin mechanism to interconnect said main vending relaymeans directly with said power source. 8. The invention defined in claim1 wherein said vending sequence switch means includes a reset switch 5for said selector relay means;

dient dispensing means while enabling an otherwise complete vendingcycle and selectively enabling said ingredient dispensing means whileprecluding a complete vending cycle, said selective disabling functioneffecting a flushing and cleaning cycle and said selective enablingfunction effecting a test cycle only of said ingredient dispensingmeans. 9. The invention defined inclaim 1, wherein said vending sequenceswitch means includes a reset switch for said selector relay means;

wherein said selector relay means are interconnected through a commonreset circuit path with said reset switch means;

wherein each of said selector relay means comprises an actuating coiland said common reset circuit path comprises a resistance in series witheach said coil, connected through a common diode means to said resetswitch means;

wherein said control circuit further includes manual switch meansselectively disabling portions of said vending sequence switch means,.to modify said vending sequence for testing said control circuit whileprecluding actuation of said ingredient dispensing means and selectivelyby-passing said coin mechanism to interconnect said main vending relaymeans directly with said powersourc e;

wherein said control circuit further includes means for flushing andcleaning an associated vending machine; and

control switch means selectively disabling said ingredient dispensingmeans while enabling an otherwise complete vending cycle and selectivelyenabling said ingredient dispensing means while precluding a completevending cycle, said selective disabling function effecting a flushingand cleaning cycle and said selective enabling function effecting a testcycle only of said ingredient dispensing means.

10. The invention claimed in claim 1 wherein said control circuitincludes circuit means including said selector relay means for providingconnection to a power source when said vending relay is latched in itsquiescent state and one of said selector relay means is latched in itsvend state, thereby providing power for completion of a vending sequenceafter said vending relay has been latched back to its quiescent statebut one of said selector relay means still is in its latched vend state.

1 1 l 2 11. The invention claimed in claim wherein the 12. The inventionclaimed in claim 10 wherein said circuit means for providing connectionto a power claimed circuit means includes source when the vending relayis latched in its quiesmeans for sequencing said vending sequence switchcent state includes means in said vending sequence means through itsvending sequence. switch means. 5

1. A vending machine control circuit comprising: coin mechanism means;main vending relay means responsive to said coin mechanism means toenable said control circuit for a vending sequence; selector relay meansfor selecting ingredients to be dispensed including manual selectormeans for each said selector relay means designating at least oneingredient to be dispensed in a given vending sequence; vending sequenceswitch means controlling the execution of a vending sequence in responseto a concurrent change of state of said main vending relay means and oneof said selector relay means from a quiescent state to a vend state; asource of electric power; circuit means interconnecting said mainvending relay means with said power source through said coin mechanismmeans, and said selector relays with said power source through said mainvending relay means; ingredient dispensing means interconnected with andenabled by respective ones of said selector relay means forinterconnection and actuation by said vending sequence switch means;said manual selection means for said selector relay means comprisingcircuit means precluding concurrent actuation of more than one of saidselector relay means; said main vending relay means and said selectorrelay means being magnetically latched in both said quiescent and vendstateS thereof to preclude false vending; and means including circuitmeans associated with each of said selector relay means for latchingsaid vending relay back to its quiescent state upon the latching of aselector relay to its vend state, the return of said vending relay tosaid quiescent state operating to disable said manual selector means forthe selector relay means, thereby prohibiting the premature initiationof a subsequent vending sequence.
 2. The invention defined in claim 1,wherein said vending sequence switch means includes a reset switch forsaid selector relay means; and wherein said selector relay means areinterconnected through a common reset circuit path with said resetswitch means.
 3. The invention defined in claim 2, wherein each of saidselector relay means comprises an actuating coil and said common resetcircuit path comprises a resistance in series with each said coil,connected through a common diode means to said reset switch means. 4.The invention defined in claim 1, wherein said control circuit furtherincludes manual switch means selectively disabling portions of saidvending sequence switch means, to modify said vending sequence fortesting said control circuit while precluding actuation of saidingredient dispensing means and selectively by-passing said coinmechanism to interconnect said main vending relay means directly withsaid power source.
 5. The invention defined in claim 1, wherein saidcontrol circuit further includes means for flushing and cleaning anassociated vending machine; and control switch means selectivelydisabling said ingredient dispensing means while enabling an otherwisecomplete vending cycle and selectively enabling said ingredientdispensing means while precluding a complete vending cycle, saidselective disabling function effecting a flushing and cleaning cycle andsaid selective enabling function effecting a test cycle only of saidingredient dispensing means.
 6. The invention defined in claim 1,wherein said control circuit further includes manual switch meansselectively disabling portions of said vending sequence switch means, tomodify said vending sequence for testing said control circuit whileprecluding actuation of said ingredient dispensing means and selectivelyby-passing said coin mechanism to interconnect said main vending relaymeans directly with said power source; wherein said control circuitfurther includes means for flushing and cleaning an associated vendingmachine; and control switch means selectively disabling said ingredientdispensing means while enabling an otherwise complete vending cycle andselectively enabling said ingredient dispensing means while precluding acomplete vending cycle, said selective disabling function effecting aflushing and cleaning cycle and said selective enabling functioneffecting a test cycle only of said ingredient dispensing means.
 7. Theinvention defined in claim 1, wherein said vending sequence switch meansincludes a reset switch for said selector relay means; wherein saidselector relay means are interconnected through a common reset circuitpath with said reset switch means; wherein each of said selector relaymeans comprises an actuating coil and said common reset circuit pathcomprises a resistance in series with each said coil, connected througha common diode means to said reset switch means; wherein said controlcircuit further includes manual switch means selectively disablingportions of said vending sequence switch means, to modify said vendingsequence for testing said control circuit while precluding actuation ofsaid ingredient dispensing means and selectively by-passing said coinmechanism to interconnect said main vending relay means directly withsaid power source.
 8. The invention defined in claim 1, wherein saidvending sequence switch means includes a reset switch for said selectorrelay means; wherein said selector relay means are interconnectedthrOugh a common reset circuit path with said reset switch means;wherein each of said selector relay means comprises an actuating coiland said common reset circuit path comprises a resistance in series witheach said coil, connected through a common diode means to said resetswitch means; wherein said control circuit further includes means forflushing and cleaning an associated vending machine; and control switchmeans selectively disabling said ingredient dispensing means whileenabling an otherwise complete vending cycle and selectively enablingsaid ingredient dispensing means while precluding a complete vendingcycle, said selective disabling function effecting a flushing andcleaning cycle and said selective enabling function effecting a testcycle only of said ingredient dispensing means.
 9. The invention definedin claim 1, wherein said vending sequence switch means includes a resetswitch for said selector relay means; wherein said selector relay meansare interconnected through a common reset circuit path with said resetswitch means; wherein each of said selector relay means comprises anactuating coil and said common reset circuit path comprises a resistancein series with each said coil, connected through a common diode means tosaid reset switch means; wherein said control circuit further includesmanual switch means selectively disabling portions of said vendingsequence switch means, to modify said vending sequence for testing saidcontrol circuit while precluding actuation of said ingredient dispensingmeans and selectively by-passing said coin mechanism to interconnectsaid main vending relay means directly with said power source; whereinsaid control circuit further includes means for flushing and cleaning anassociated vending machine; and control switch means selectivelydisabling said ingredient dispensing means while enabling an otherwisecomplete vending cycle and selectively enabling said ingredientdispensing means while precluding a complete vending cycle, saidselective disabling function effecting a flushing and cleaning cycle andsaid selective enabling function effecting a test cycle only of saidingredient dispensing means.
 10. The invention claimed in claim 1wherein said control circuit includes circuit means including saidselector relay means for providing connection to a power source whensaid vending relay is latched in its quiescent state and one of saidselector relay means is latched in its vend state, thereby providingpower for completion of a vending sequence after said vending relay hasbeen latched back to its quiescent state but one of said selector relaymeans still is in its latched vend state.
 11. The invention claimed inclaim 10 wherein the circuit means for providing connection to a powersource when the vending relay is latched in its quiescent state includesmeans in said vending sequence switch means.
 12. The invention claimedin claim 10 wherein said claimed circuit means includes means forsequencing said vending sequence switch means through its vendingsequence.